Kay MA-4 20 HP Phasemaster Rotary Type Phase Converter
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Email or call us at 1-800-222-6133 for availability, any further discounts, freight quote plus any questions you may have. Please include your shipping information (i.e., commercial or residential delivery, whether a lift gate is needed, etc.) and zip code.
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Collapse into tabsHighlights:
- Maximum motor horsepower 20 HP
- Maximum total horse power 60 HP
- L 21, W 21, H 28, Wt. 487lbs
- Power 1ph motors from a 3ph power supply
- Other sizes are available so please call us for more information
Is Rotary or Static for You?
Rotary 3-phase converters are the most flexible and reliable type of phase converter. They produce true 3-phase power to run any type of load or combination of motors. For this reason, Kay Industries recommends rotary phase converters for most applications requiring a phase converter.
Static 3-phase converters do not produce true 3-phase power. In fact, static phase converters are little more than electric rope starters. Unlike a rotary phase converter, static phase converters cannot balance the load between the three legs after the motor has started. As a result, static 3-phase converters never allow your motor to develop full horsepower. Static phase converters are thus suited only for small-horsepower, single-motor applications. In addtion, they cannot be used for heaters or rectifier loads.
Consider a static 3-phase converter only if your application:
- Starts quickly
- Starts infrequently (less than four times in an hour)
- Runs at less than 70% of its nameplate horsepower
Full nameplate output for extended periods is only possible with a rotary phase converter. If your application requires a long acceleration time, you'll need a rotary phase converter.
Check the table below for more comparisons between rotary and static phase converters.
| Feature: | Rotary | Static |
| Single motor loads | Yes | Yes |
| Multiple motor load | Yes | No |
| Rectifier & heat loads | Yes | No |
| Load output | 100% of NP rating | 60-80% of NP rating |
| Limits on load starts | None | 6 per hour |
| Long term reliability | Very High | Adequate |
| Variable load range | High | Limited |
| Relative cost | High | Low |
| Efficiency at full load | >99% | 95% |
| HP range | 1 - 500 | 1/2 - 20 |
| Maintenance Requirements | None | Some but minimal |
If a static phase converter is right for your application, the MiniPhase Static 3-Phase Converter is the best you can buy, it is built with the same attention to engineering quality and comes with the same service and documentation that has made Phasemaster Rotary Converters the industry leader.
This item ships via Common Carrier
, we will ship to a commercial location with a loading dock for our standard $6.50. Just select Standard Ground
at checkout. Additional options, like a residential delivery or lift gate service will be additional charges. Please see our Shipping Information Page for further details.
The MA-4 includes:
- Kay Model MA-4 Rotary Type Phase Converter
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